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Question

A bulb marked 12 V, 24 W operates 12 volt battery for 20 minutes. The energy consumed is:


A
28800J
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B
360000J
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C
25660J
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D
144000J
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Solution

The correct option is A $$28800 J$$
Energy ($$power\times time$$) is measured in Joules and by including time (t) in the power formulae, the energy dissipated by a component or circuit can be calculated.

Energy dissipated Q= Pt.

In the question, the time taken is given as 20 minutes, that is $$20\times 60=1200\quad seconds$$ and the power is 24 W.

Hence, the energy consumed by the bulb is $$24\quad W\times 1200\quad s=28,800\quad Joules$$. 

Physics

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